吉林大学学报(工学版)

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Microstructure and property of spot welded joint of ultrahigh strength steel and microalloy steel

GU Zheng-wei1，ZHANG Zheng-lin1，LI Xin1，HAN Li-jun2，XU Hong1   

  1. 1.College of Materials Science and Engineering, Jilin University,Changchun 130022,China；2.The FAWWolkswagen Automobile Company LTD., Changchun 130042, China
  • Received:2008-01-06 Revised:2008-05-06 Online:2009-05-01 Published:2009-05-01

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Abstract:

Precision ultrahigh strength steel EN 10 292 TL4225 and microalloy steel H340 LAD are selected for the study. The intermediate frequency (IF) spot welding process is used. The perfect welded joints by using the appropriate welding parameters are produced. The tension strength and the hardness distribution of the welded joint tested, and the microstructure of the fracture surface is analyzed by scanning electron microscope. The test results show that the welded joints have good microstructure and mechanical performance, no internal defects such as crack and shrinkage hole are found, and the mechanical performance completely meets the actual need of product.

Key words: materials synthesis and processing technology, ultrahigh strength steel, microalloy steel, intermediate frequency, microstructure and mechanical performance

CLC Number: 

  • TG442
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